Warning: Watch Before Preparing Your PowerPoint

I'm preparing for multiple presentations over the next couple of weeks, and was Googling to find data on the effectiveness of learning aids in viewer retention and comprehension. Came across this video that every presenter should see while preparing their PowerPoints.

The video is a teaser for a book entitled Habitudes for Communications by Dr. Tim Elmore that you can find here. I have not read the book, but I may do after I finish my PowerPoints. Video definitely makes you think.